Answer:
For making reforms in order to rebuild and strengthen the military.
Step-by-step explanation:
Emperor Heraclius reorganized the military by making reforms in order to rebuild and strengthen the military because powerful military is necessary for the protection of their lands and defeating the enemies in the wars. Due to these reforms he was able to defeat the the Persian empire and throw them out of their lands so we can say that these reforms has a great impact on the empire of Heraclius.